Linux Kernel up to 6.18.39/7.1.4 ALSA USB Audio Qualcomm Driver handle_uaudio_stream_req out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.49

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 6.18.39/7.1.4. This affects the function handle_uaudio_stream_req of the component ALSA USB Audio Qualcomm Driver. Performing a manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2026-72446. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.39/7.1.4. It has been classified as very critical. This affects the function handle_uaudio_stream_req of the component ALSA USB Audio Qualcomm Driver. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: qcom: reject stream disable with no active interface handle_uaudio_stream_req() resolves an interface index with info_idx_from_ifnum(), which returns -EINVAL when no interface matches. The enable branch and the response: cleanup label both guard against a negative index, but the disable branch does not: it forms info = &uadev[pcm_card_num].info[info_idx] and dereferences it. uadev[].info is a pointer allocated only when a stream is first enabled, so a negative info_idx on the disable path is unsafe in two ways: - If the card was never enabled, .info is NULL and &info[-EINVAL] is a wild pointer; reading info->data_ep_pipe faults (kernel oops). - If the card was enabled at least once (.info allocated) and the disable names an interface that does not match, &info[-EINVAL] points before the allocation; info->data_ep_pipe / info->sync_ep_pipe are an out-of-bounds slab read and, when non-zero, an out-of-bounds 4-byte write (both pipe fields are cleared to 0). That is memory corruption, not just a NULL dereference. The request is reachable from unprivileged local userspace over AF_QIPCRTR. Reject a disable request with no resolved interface, matching the guard the enable path already has.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-72446 since 08/09/2026. The exploitability is told to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 25a867aa5e67a84333fa6e5c21292c5bcff86b90/a22356d1f731553e99aa2707dbd38c659bdd28d8/bdb640be82e645e2828731648f485224d0c2587b is able to eliminate this problem.

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Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.40/7.1.5/7.2-rc1
Patch: 25a867aa5e67a84333fa6e5c21292c5bcff86b90/a22356d1f731553e99aa2707dbd38c659bdd28d8/bdb640be82e645e2828731648f485224d0c2587b

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72446 (🔒)
GCVE (CVE): GCVE-0-2026-72446
GCVE (VulDB): GCVE-100-391047

Entryinfo

Created: 08/15/2026 17:16
Changes: 08/15/2026 17:16 (59)
Complete: 🔍
Cache ID: 216::103

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